Whether to shop together or not is totally a personal choice. If you're unsure how your BF would feel about this, you could ask. In my case, I told my hubby that he could propose whenever/however he wanted, but I wanted the ring process to be a joint endeavor. He was totally cool with it. Some men are more traditional and want to do it all by themselves, in that case, find out if he's open to the idea of you giving him pointers (i.e., magazine clippings, etc). If he's not open to having your input AND you've got your heart set on a specific ring, then it's time for a serious convo with your man.
In the end, most guys just want their ladies to be happy...with the proposal, with the ring, and with the fact that you'll be together forever. So having a serious conversation (or two, or three) about your expectations is the best idea.
In the end, most guys just want their ladies to be happy...with the proposal, with the ring, and with the fact that you'll be together forever. So having a serious conversation (or two, or three) about your expectations is the best idea.